Piston pressure gauge



P 7 J. sHEBol. E'r Ax.

PISTON PRESSURE GAUGE 'Filed Jan. 22, 1925 ATTORNEYS.

m7/ f. 'A5

Patented sept. 13, 1927.

UNITED vSTATES PATENT OFFICE. l

JOSEPH SHEBOL AND WILLIAM F. ALBRECHT, SYRACUSE, NEW YORK; SAID SiHEBOL .ASSIGNOR T0 SAID ALBRECHT.

rPISZ'IION PRESSURE GAUGE.

Figure 1 is an elevation of this pressure gauge. e Figure 2 is an enlarged central longitudinal sectional view through the air gauge.

Figure 3 is the end view of the air chuck. Figure 4 is an end View looking forwardly in Figure 1.

This gauge comprises, generally, a tubular body having a cap at one end formed with .a slot and an air chuck having an inlet for air at the other end of the body, a piston movable in the body and having an indicator in the form of a blade extending through the slot in the cap, the blade having calibrations and indications on its fiat faces, and means for resisting the movement of the piston, the cap being rotatable about the body to turn the blade in such position that its iiat faces are in reading position, that is, are in position to be easily read by the observer.

1 designates the tubular body.

2 is the cap at the outer end of the body, which cap is Arotatable about the body and interlocked therewith against endwise move ment.

3 `designates generally the air chuck at the other end of the body.

4 is the`piston movable in the body 1.

5 is lthe indicator in the form of a blade movable with the piston, the indicator ex- 45 tending through aV slot 6 in the cap.

7 is the sprin located in the body 1 .and encircling the in icating member and thrustin at one end against the piston and at its oter end against the cap. n

The cap 2 as here shown is provided with a sleeve portion enclosing the end of the tubular body 1 and having an inturned flange 8 which interlocks in an annular placement.

The air chuck 3 'is'Y combined with a head 10 at the end of the tubular body 1, the

head 9 beingl here shown as s herical in form y and as setfinto the end oft e tubular body l and secured thereto as by soldering or welding.v The head is formed withl an inlet passage 11. The chuck 3`is in the form of a cup shaped body having a passage 12 com,-` municating with the passage 11 and opening through the bottom of the cup. A 'suitable packing or seal as a relatively thick rubber Washer 13 is tted in the cup shaped body against the bottom thereof, and a valve opening plug 14 is located within the washer 13 and has a stem threading into the sage 12. The rubber washer 13 is hel in position by the turned over outer edge 15 of the body of the chuck. The valve opening plug 14 is however held in posit-ion by its stem threading into the passage 12. Neither the washer 13 is held in position by the plug 14, nor the plug 14 by the washer.

The piston 4 is provided with a packing washer 16 on its pressure face and the piston is provided with means as a screw 17 having its head arranged in advance of the washer 16 for engaging the heads and thus preventing the packing 16 from coming in contact with the head, so that crushing and distortion of the packing is avoided.

The indicator blade is provided with suit able graduations 18 and indications as numerals 19 at intervals, these being located on the fiat faces of the blade.

In operation, the air chuck is pressed upon the end of the valve stem of a tire, the stem of the check valve in the valve stem of the tires projecting at the end of the tire valve stem engagin the valve opener 14 and the end of the va Ve stem ofthe tire embedding into the rubber washer or seal 13. When the check valve of the tire is thus open, the pressure through the passages 12 and 11 into the body 1 moves the piston 4 outwardly against the action of the spring 7 and the reading visible on the blade 5 in line with the outer face of the cap indicates the number of pounds ressure there is in the tire.

In or er to bring the indicator into reading osition, the cap 2 is turned, thus turning the `indicator 5 to bring thellat faces thereof into reading osition.

What we c aim is:

1. A pressure gaugecomprisinga tubular body havinga cap at its outer end formed fwith aslotland -an inlet `at .its inner end, `a. piston `movable in `the body and an umdrcator in` theJ form of arlflat `blade `movable `with the piston and projecting therefrom and through the slot andhaving graduations on one of its faces, the cap having): sleeve i portion inclosing the end of the y and such sleeve portion having an inturned `flange atits inner end and the `body being formed with anannular groove for receiving the `flange `whereby the capisrotatable about the i bod to bring the `flat faces. of the indicator t bla e into readin positionzanda sprin located `in the bodyietween the piston an the head oef-the cap.

2. A gauge comprising a tubular body havingla combined head and air chuck at one end, the head having. spherical portion extending into the end of the tubular body and bearing against the circular edge of the tubular body and secured thereto, the head havin a passage therethrough.

3. `pressure gauge comprising a tubular body having a cap at its outer end formed within slot and an inlet at its inner end, a piston movable in thebody and tan indicator in the form of a flat plate movable with the piston and rojectin therefrom, and through the slot, t e plate avin graduations onone of its faces, the cap aving `a sleeve portion enclosing the end of the 

